Hello,
I just installed construct 2 free.
Created new project and Layout looks like having dotted grey transparent layer over it.
View -> grid options -> show grid (checkbox) ?
that doesnt help. that triggers some other grid , but not this smalldotted one shown in screenshot.
This happens on freshly installed windows 8.1 (ati radeon r5 235 gpu).
I just now made windows 7 installation into virtualbox and installed freshly downloaded c2 - and there I dont have that "grid".
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Make sure you have the latest graphic drivers installed
well.. i did install latest drives from amd (ones from windows8 install/windows update were older).
but that did change anything. still that weird grey-dotted-curtain there...